<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-button type="primary" @click="showForm">添加商品分类</el-button>
    
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        class="treeTable"
        :show-row-hover="false"
      >
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen;"
          ></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>

    <!-- 添加商品分类弹窗 -->

    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%">
      <!-- 添加分类的表单 -->
      <!-- model的作用？ -->
      <!-- 这个model的作用是用来校验的 -->
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- 级联菜单 -->
          <el-cascader
            expand-trigger="hover"
            :options="parentCateList"
            :props="cascaderProps"
            v-model="selectedKeys"  
            @change="parentCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
// 前端分页
// 我请求api接口 后端的返回了100条数据
// 后端分页
// 也就是api接口 支持分页查询 就是在调用api接口的时候 需要传递参数 pagenum pagesize
export default {
  data() {
    return {
      catelist: [],
      total: 0,
      queryInfo: {
        query: "",
        // 当前的页数
        pagenum: 1,
        // 当前每页显示多少条数据
        pagesize: 5
      },
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok"
        },
        {
          label: "排序",
          type: "template",
          template: "order"
        },
        {
          label: "操作",
          type: "template",
          template: "opt"
        }
      ],
      addCateDialogVisible: false,
      addCateFormRules: {
        'cat_name': [{ required: true, message: "请输入商品名", trigger: "blur" }]
      },
      // 添加分类的表单数据对象
      addCateForm: {
        // 将要添加的分类的名称
        cat_name: "",
        // 父级分类的Id
        cat_pid: 0,
        // 分类的等级，默认要添加的是1级分类 0是1级分类  1是2级分类  2是3级分类
        cat_level: 0 
      },
      parentCateList: [],
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      selectedKeys:[] // 级联选择器上的选中的数据要定义为数组
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo
      });
      if (res.meta.status == 200) {
        this.$message.success("数据获取成功");
        this.catelist = res.data.result;
        this.total = res.data.total;
      }
    },
    // 监听 pagesize 改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    // 监听 pagenum 改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    showForm() {
      this.addCateDialogVisible = true;
      this.getParentCateList();
    },
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 }
      });

      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败！");
      }
      this.parentCateList = res.data;
    },
    parentCateChanged(){  // 来确定添加的分类的父级id以及自身的分类等级
      console.log(this.selectedKeys)
      if(this.selectedKeys.length>=1){ // [1,3]
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1] // 3
        this.addCateForm.cat_level = this.selectedKeys.length // 0 1 2 
      }else{
        this.addCateForm.cat_level = 0
        this.addCateForm.cat_pid = 0
      }
    },
    addCate(){
      // 表单提交前的预校验
      this.$refs.addCateFormRef.validate(async vali => {
        if(!vali){
           return this.$message.error('请重新输入')
        }
        const { data : res } = await this.$http.post('categories',this.addCateForm)
        if(res.meta.status != 201){
          return this.$message.error('添加失败')
        }else{
          this.$message.success('分类添加成功')
          this.getCateList();
          this.addCateDialogVisible = false;
        }
      } )
    }
  }
};
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}
</style>

